The AirDog Replacement Fuel Filter FF100-10 is a direct replacement Fuel Filter for your AirDog Fuel System. The life expectancy for the AirDog Fuel Filter could be up to 25K miles or a year. However, those figures can change drastically depending on fuel quality. We run the 10 micron filter in colder weather conditions. For warmer condition or climates use the 2 micron for even more filtration.